@misc{indiciaeedf74e5826fe,
  title = {[A system for respiratory flow proportional sampling].},
  author = {H Bytel and J Keitel and M Seifert and P Schmidt},
  year = {1989},
  url = {https://pubmed.ncbi.nlm.nih.gov/2800652/},
  note = {Source identifier: 2800652}
}